Small chlorine tablets with SmartGuard. These economical and easy to use chlorine tablets are applied directly to the spa via your skimmer or chlorine tablet feeder. They dissolve slowly and evenly to give consistent and long lasting chlorination with minimal effect on pH value. If your spa is not equipped with a tablet dispenser simple pop up to 8 tablets in a floating dispenser and let it bob around your spa slowly releasing chlorine to prevent the levels falling whilst your spa is not in use.